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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Chapter 15 Diagnostic Tests
ISDN Network Loopback Test
ISDN Network Loopback Test
This section describes the Network Loopback (NLB) Test for ISDN PRI trunks (ISDN NLB) feature.
Network Loopback Test for ISDN-PRI trunks (ISDN NLB) feature allows operators to conduct network
loopback testing originating from shared ISDN PRI trunks. The shared test trunk group accepts both
normal and test calls. Test calls are identified by provisioning the call-type and call-subtype tokens in
the Destination table.
The BTS 10200 cannot perform network loopback test calls that originate from another switch and does
not route calls from a testing device on an H.323 or SIP interface.
Note
The network loopback test cannot be performed if the status of the subscriber to be tested is
unequipped
(
UEQP
)
or
operational-out-of-service
(
OOS
).
Configuring
The following items must be configured:
•
Test origination endpoints as trunks instead of line.
•
Special dial plan and destination with call-type=test-call.
•
Call-subtype must be configured as one of:
–
nlb-line-test
–
nct-line-test
–
nlb-trunk-test
–
nct-trunk-test